Winding machine



Feb. l, 1944. E A NORDBERG wINDING MACHINE Fild oct. 14, 193s a'sheets-sheet 2 INVENTOR Qw /Vvrdber7 @www ATTORNEY Feb. l, 1944.

WINDING` MACHINE Filed lOGIZ. 14, 193g 6 Sheets-Sheet 4 BY A TORNEY E. A. NoRDBERGV 2,340,340

Feb. l, 1944.

. E. A. NORDBIERG 2,340,340

i WINDING MACHINE Filed` oct. 14, 93B e sheets-.sheet s M ATTORNEY Feb. l, 1944.

E. A. NQRDB'ERG 2,340,340

WINDING MACHINE l Filed 001'.. 14, 1938 6 Sheets-Sheet 6 Patented Feb. 1, 1944 WINDING MACHINE l Ernst A.,Nordberg, Sharon, Massi, assignor to Production Development Corporation, Canton, Mass., a corporation of Massachusetts Application October 14, 1938, Serial No. 234,881

12 claims. (o1. 24a- 56) I The present invention relates to a Vwinding machine for winding together in a roll ribbons of metallic foil separated by ribbons of insulating material.

While the machineAmay-ind `useful application for other types ofwindings, itis particularly applicable to a= machine for winding electrical condensers of both the paper and electrolytic types.

i In electrical condensers there are provided two metallic foils or plates'which areseparated and vinsulated from eachother iby means of a dielectric element.

In the plate type 'of condenserA the metal may be sheets of copper-or aluminum separated by layers of mica, paper or othermaterials. Usually anumber of` layers of metal sheets or foil are used stacked one over the other with paper or other insulating means between. Each onegroup of the metallic plates or foil are connected to one electrical-terminal and the other group to another `electrical terminal, the important point `being that'the groupsfthemselves are entirely insulated from each other. In theroll type ofelectric condenser the same general principle is followed and in the winding process therefore four or ve sheets of material may be brought together. In each case the paper separating the foil with one set of foils being connected tovone electrical terminal and the oth'erset of foils connected to the other electrical terminal. In these employed are lso called semi-automatic, in vthat certain operations must be performed by hand, although the Winding itself is usually done by adjusting the' foil strips on a mandrel which is turned by an electric motor. 'There 'are a numberof reasonswhy the machines for thelmost part arevnot fully automatic. In the first place the metallic foil and the paper are so thin `that itis diiiicult to handle them with machinery. Both paper and foil easily tear, particularly in the types of machines that 'must be stopped and started for trimming the ends so that the end edges of the foil do not touch. If all the foil sheets are cut simultaneously and simply wound on the roll; the end edges of the foil are usually so close together that ther-eis a possibility of frayed edges to make rcontact with each other or yeven if this is not possible, the `ends of the foil 1 and Iwithoutchange of speed.

thatcarry oppositeelectrical potentials arefc'loser than normal electrical specifications will allow. It is necessary tolsee in all'cases that the ends of the paper generously cover the foil beneath -so that thereis no `possibility vof'electrical .connec tion or contact at the ends cf'the foil. 'In addition to this `because the 'foil andpa-perl are'both very thin and flexible, the stopping and starting of the .winding must be done slowly, andfor this reason considerable time iis used in this workin the winding ofthe condenser roll. It'should also be noted that while it has been attempted'to use -means of pushingthe foil in the feedingmechanism, this isextremelydiicultand therefore the foil is preferably pulled'sor drawn and special effort must be made to have this occur uniformly According totherpresent invention therefis provided a winding machine for wind-ing together in a roll ribbons. oi metallicfoil Aseparated by ribbons of insulating-material, .including mandrels operating in `cycles and adapted to continuously draw said ribbons from rollslor the like, said mandrels being arranged V'so that asfthe ribbons are 'fseveredfrcm one mandrel/they are *simultan'eously gripped'by another mandrel to 'continue uninterruptedly the drawing of said ribbons., v In the present inve'ntion'the` condenser is en tirely Wound automatically, the only hand loperation beingthe-initial' threading ofthe machine to put the strips in their proper-position. When a complete set of rolls of paper and foil havebeen used, the machine lis stopped and a new set is inserted, whereupon the machine will wind the entire set of supply `rolls that feed it.

In the present invention both the starting and stopping o the foil havebeen avcidedthe foil is drawn at a nearly `constant'speed in spite of the fact that the stripsfof foil land paper are cut from the roll as each condenser isbeing made and each condenser winding is finishedin such a way that the paper overlaps the foil and prevents any electricalconnection at theends ofthe IfOil.

In accomplishing" the results" of the present invention, `a machine isA employed in which each operationisduplicated one on one half of the machine and Athe other on the other hal-f' of the machine in a phase displacement that'is 180 apart. This will be explained more in detail later in the specification. g

In this machine the proper lengths of foil and paper are established after the winding has comthe description given below of an embodiment of the invention as illustrated by the drawings annexed hereto:

Figure 1 `represents a perspective view of the entire machine as viewed from the right forward end.

Figure 2 shows a sectional view of the machiney through the center on a slightly different scale from that shown in Figure 1 and looking from the opposite side of the machine from the perspective view taken in Figure 1.

Figure 3 shows a sectional view of a portion of the machine.

Figure 4 shows a plan View of a portion of the machine as viewed from the top of Figure l.

Figure 5 shows a section taken on the line 5-5 of Figure 4.

Figure 6 shows a section of a detail on the line 6-6 of Figure 4.

Figure 7 shows a section of a detail on the line 1--1 of Figure 1.

Figure 8 shows a detail of the glue pot mechansm shown in Figures 1 and 2.

Figure 9 shows a side view of Figure 8 as viewed from the left side of Figure 8.

Figure 10 illustrates diagrammatically the cycle ofLv operation of the machine. Y

Figure 11 shows diagrammatically the threading` of the paper and foils for the winding as employed vin the machine described in the previous figures.

vFigures 12 and 13 show respectively how the -ends of the foil and paper are severed for the beginning of the winding on the mandrel and the finishing of the winding on the roll.

Figure 14 shows a completed roll. 'l

Figure 15 shows a modified method of winding in-.diagrammatic form.

Figures 16 and 17 illustrate the relative position of the foil and paper respectively at the beginning Vof the winding on the mandrel and the end of the winding on the roll when using the method shown in Figure 15.

. Figures 18,- 19 and 20 illustrate a further modification in the same respective relation as Figures 11, l2 and 13, and,

Figures 21, 22, 23, 24 and 25, illustrate still vfurther modifications in the arrangement of the foil and paper at the beginning of the winding Figure 28 shows a side elevation of one ofl ,the cams of the present machine.

In Figure 1 the machine is shown mounted on supporting legs 2| upon which rests the base plate A20 with guide rails 22-22 and 23-23. The guide Vrails 22 serve to guide the platform 24 at the right of the machine and the guide rails 23 serve in a similar capacity for the platform 25. Each of these platforms reciprocates back and forth on the rails 22 and 23, respectively, being forced in one direction by means of the cams 3l and 33,

respectively, and' being returned in the other `direction by means of springs oneof which is shown at 34. Each of lthese cams is so set and thejother parts of the machine so arranged, that the movement of each platform and every opervation, associated therewith are similar but have a phase difference of 180 in the entire cycle of operation. y. y

n Fach platform 24 and 25 has mounted thereon a pair of guide rails, the guide rails for the platform 24 being indicated by 26 and 21. The guide rails for the platform 25 are at the back of the supporting bracket and therefore not shown 5 in the drawings.

Moving on the guide rails 26 and 21 are the platforms 26, 29, supporting the upright plates 3l) and 36, the latter of which carries the plates provided with rods to guide and control the strips 10 of foil and paper, Vthe knife mechanism and the gluing mechanism which will be explained in detail later. The platforms 24 and 25 provide the longitudinal motion of the mechanism and the platforms 28 and 29 provide the transverse l5 motion of the mechanism for providing the complete winding procedure. Themechanism itself that produces the positioning, winding and guiding of the foil, will be more readily understood by considering initially the diagrammaticgarrange- 20 ment of Figure 11 on connection with the cross sectional view of Figure 2 which shows the winding as taking place on the mechanism carried by platform 28. In the machine there are provided a set of fixed guide plates through which the 25 foil and paper are initiallythreaded.y As indicated in Figures 2 and 11, the lower guide plates and 4I are used for the paper strip 42, the next guide plates 43 and 44 for the Vfoil 45. Through the third guide plates 46 and 41 there are thread- 30 ed two strips of paper 48 and 49. Above these are further guide plates 50 and 5I` between which there is placed the foil 52 and a top pair of guide plates 53 and 54 holding the paper 55. The foil and paper pass between theseplates being drawn change in the rate of advance of either the paper or foil. On either side of the several guide plates there are positioned as shown in Figure 11, rods I to IU carried by the supporting plates 30 on either side of the machine. All of these rods advance forward in the winding process in the direction of the arrow A and some of these simultaneously'move transversely to the direction of travel of the strips to lengthen in the proper amount the length of paper and foil as it is being wound on the roll, so that while the horizontal distances between the rods always remain the same, the vertical position with respect to each other may be changed as will be noted in the description below. For this purpose the rods l, 2 and 3, 4, 5, 6, 1 and 8, retaining their permanent horizontal relationship are mounted directly in the upright bracket or plate 30, while those that move also in the vertical directions are mounted in moving blocks or plates shown in Figures 2 and 4. Each moving block or plate 56, 56 has a projecting ange 51 which is dovetailed into an insert 58 mounted permanently or fixed in the plate 36. There are two of such plates for each side of the machine. These are indicated in Figure 2 which shows the upper plate 56 and a lower plate 56' carried by the platforms 28, and upper` plate 91 and lower plate 92 oarried by the platform 29. Each of these plates 1'" upper and lower is moved substantially in the same manner towards a common center line by means of the cam plates 59 and 60 respectively and returned by means of the springs 6I and 62 shown in Figure 2 for the plates 91, 92. The springs 6| and 62 pull the plates 56 and 56 in directions against the cams 59 and 60 and are fastened to xed supports in the platforms as for instance the plates 36 and 36' and tend therefore always to separate the plates 56 and 56.

Referring now to Figures 2 and 1,1, it will be continually in the winding process without a great tion illustrated diagrammatically in the left half of the Figure 11. The table or platform is then advanced towards the front part of the machine and the rods or rollers are thereby brought into their new position to lengthen out the strips of foil and paper so that the rolls will be properly wound. As this advance occurs all the strips of foil and paper are brought together in face to face relationship by the upper and lower blocks 56, 5B or 91 and 92 being forced together as the rollers 14 and 15 ride on the cams 59 and 60. When these blocks come together, then the paper is ready to receive the mandrel 16a or 16 of the other winding mechanism, which mandrel enters from the opposite side of the machine through the slot 98, as the opposite platform 29 or 28 shown in Figure 1 moves inwardly at the beginning of the cycle. At the beginning of the cycle therefore, the mechanism at one side of the machine has already assembled together the paper and foil so that the mandrel of the other side of the machine may enter over the' paper and foil. Mechanism is also provided to align the slot or cut in the mandrel horizontally so that it will engage the foil and paper in the same horizontal position. This will be explained later. By the time that the mandrel on one side has engaged the strips on the other side, the papers and foils have already been adjusted to their proper lengths. The rod 5 or 5a has been moved downward by means of the cam plate 8B to the end of the slot 9| and the rods `9 and I0 or 9a and |0a have been moved upwards through the movement of the plate 92 or plate 50'. In advance of the mandrel entering at the beginning of the cycle, there is the second mandrel indicated in Figure 11 as 16. This has already completed part of its winding as the first mandrel is moving towards the center to enclose the foil and paper so that when the knife vmechanism is operated by means of the projecting flanges 19 and 18 at the end of the cam plates 59 and 60, this mandrel has completed its winding except for the winding of the free ends severed by the knife blade. At the instant of cutting, the rods 03, 64, 65, 06, 61, 68, 69 and 10, Vhold the papers `and foil together and the knife 'blade 82 comes down over the knife shoe B3 severing both foil' and paper. Immediately after this the rollers 14 and 15 move beyond the cam plates 59 and 60,' whereupon the springs 6| and 62 pull the blocks or plates apart freeing the foil and paper which is thereupon wound up and finished in the manner to be described. Following the completion of this travel as has been mentioned above, the lever 85 acts to throw outward the platform 28 and the associated spring (not shown but corresponding to spring 34) pulls back the platform 24 to the end of the machine. At the back end of the machine the cycle; begins to repeat itself. The cycle begins by the mechanism that carries the plates or platform 28 inward to the machine. This is accomplished by means yof the sprocket gear 99, Figure 3, which is continuously rotated from a power source and which carries a crank arml |00 from the end of which projects a pin |0| moving in a slot |lll2 in a .bracket or support |03 on the platform 281 shown more clearly in Figure 1. As the pin |0| enters the slot |02 and the crank arm |00 rotates, the platform 28 is moved inwardly.

Before the platform 28 begins to move inwardly Ythrough the rotation of the sprocket gear 99, kthe spring corresponding to the spring 34 as has been mentioned above, returns the platform 24 CFI Vto the back of the machine. Carried at the top Iof the plate 30 is a disc |04 which has four pins |05, |00, |01 and |08, arranged at the corners of a square on the disc. The frame of the machine carries an arm |09 which is permanently fixed to it and this frame carries a projecting bar H0 having a V-shaped end the width of the bar l0 being the width of the space between two adjacent pins. As the platform 24 moves backwards, the disc |04 which is positioned on the plate 30 so that it is in alignment with the bar |0, comes into the position as shown in Figure l. This disc is mounted on the plate 30, or rather in an extension H2, Figure 4, supported from the plate 30 on a shaft ||3 which on the inner side of the plate 30 carries the sprocket gear l I4 having the sprocketrchain |5 in mesh with it. This sprocket chain drives a second sprocket gear ||6 which is on a shaft passing through the plate 315 which shaft is formed as the mandrel 16 at the other side of the plate. The gear ratio of the sprocket wheels 4 and ||6 is in the ratio of 4 tol and the mandrel 16 is so aligned with respect to the disc |04 that between whatever pins the end l of the bar I0 cornes, the slot in the mandrel will always be horizontal and be ready to receive the paper and foils.

As the platform 28 moves inwardly the sprocket wheel H8 also mounted on the same shaft as the sprocket wheel |4 rides into alignment with, and then as the platform moves forward a very little into mesh with the sprocket chain I9 which rotates on the stationary bar |20, which bar |20 is a part of the frame of the machine. The sprocket chain l! 9 is driven from the power source through the sprocket chain |2| driving the sprocket gear |22 which rotates the shaft |23 mounted in the brackets |24 and |25 on the frame of the machine. The shaft |23 drives a gear |23 which in turn drives the gear |21 on the shaft |28 on which is mounted the sprocket gear |30 which drives the chain H9. The chain H9 is continuous and is driven around the pulleys 13|, |32 and |33 situated in a rectangular fashion on the frame of the machine so that the sprocket chain I9 in the portion |34 is always in a horizontal position and adapted to mesh. with the sprocket gear H8. As the platform 24 is moved forward, it will be evident that when the sprocket gear H8 is in mesh with the chain and moves with the same velocity or speed as the chain I9 or the horizontal portion |34, no movement of the sprocket gear takes place. In this condition therefore the spindle or mandrel 16 or 15a. remains stationary. The drive of the chain |2| will be more readily seen in Figures 2 and 3. The chain |2| engages at its lower portion the sprocket gear 99 previously mentioned at the inner side of the machine then passes around the sprocket |35 on the outer side and around the lower sprocket gear |36 which is mounted on the drive shaft |31 driven from the motor |30 through pulleys |39 and |49 by means of the belt |4l. The pulley |40 is mounted at the end of the drive shaft, |31. The chain |2| after passing the lower sprocket wheel |33 extends upwards around the sprocket wheel |42 which corresponds to the sprocket wheel 99 and drives in a similar fashion the crank arm |43 having the pin |44 which engages the slot |45 corresponding to the slot V|02 on the other side of the machine.

From the description given above, it will be seen that the speed of the chain |34 is dependent aaaogero entirely upon the `gearing from ,the V'mot-or 1:36.y The table or :platform24 :is'zadvanced -bygmeans .of the cam 3| and the itable i215 .by :meansiof .the cam 33 which is similarto .the .cam 13| except-.dis-v placed by aphase differenceof 18.0 as .has .been previously stated. Both cams 3| fand33. are Valso driven from `the motor. These cams 'are mountedon adrivo shaft |46,:see .Figures land 2, which shaft |46 is driven by .the V4gear |41 which in turn is driven by thegear |46mounted on vthe shaft |49 whichis `supported inthe bearings L|56 and mounted in the bracket |52 which is attached by the flange |53 to the `base 26 ,of @the machine. Theshaft |49 atits driven endhas a toothed fgear |55 which engages the 'gear |54 mounted on .the drive shaft .|131. It` will bewseen therefore that since the drive of thecams comes also from the drive shaft |31, thatthe various elements which are driven through this `common drive shaft will remain .in synchronism. `Mounted also on `the driVeshaft |31 -are theltwo heart shaped cams |56 and |51xon which ride respectively the rolls `|58, |59 respectively `projecting from ,the arms |66 and |6| `respectively. These arms are secured to the shafts V.|62 and |63 which shafts |62 and |63 carry respectively the arms |64 and |65 which carry the bars V85. and 85 for throwing the platforms 28 and .29 respectively outward from the center of themachine at the end of the stroke. The bars 85 and :85' work against the lower sidesof the platform, see Figure 3.

As the platforms ,24 :and 25 moveto the` end `of their travel on the forward part ofthe machine, and while the platforms 28 and '261, respectively,- are `at 'their inward `position the operation for winding the ends `of the foil and paper subsequent to the cutting by the knives occurs. `This is accomplished by means of themotors |66 and |61. These motors |66 Vand |61, see Figuresl and 2, are mounted on -a bracket |68 inclinedat an angle downward at the `top of the machine.

These motorseach -carry cones .|16 which cones come in Contact with the wheels v|1| .of whichv See Figure 4. The shaft |13 upon which thegear` H4 is mountedcarriesa .gearrneshing with the gear which is mounted'on the cross shaft |12, which :shaft `also `carries the wheel |1I. `This cross shaft |12 is mounted in the .plates |13 and |14 between the `plate 36-and the plate ||2. See Figure 4. When the -fcone comes in contact with the wheel |1|, the wheel |1| rotates, thus rapidly rotating the shaft |13 and driving the sprocket chain 5 to complete the :mandrel winding completing the condenser. When the platforms 24 or have progressed to vthe forward part 4of .the machine, an arm |16 pivotedat |11.in the top of the frame, presses the roller |16 carried by the arm against the side of the condenser through the .faction of the spring |19 and keeps the ends of the foil and paperin placeun-til `they are cemented.

The gluing is accomplished Yby `.means of the glue pot |8| and its associated mechanism. `See y Figures l, 2, 8 and 9. This glue pot has aroller |62 mounted on a shaft |64 supported inthe end walls of the glue pot. This roller |82 engages in contact with a roller |83 mounted on a shaft |65 which is also supported in the walls vof .the glue pot. The glue pot has at the top an extending 4flange 256 which `rests in theside walllsvor` plates 92 or 5.6 of `the .framein which `thevertcalmovingrods ,previously described, are posipoint o'fpivot 256 of the bars i252 and 253. The bottomend of the 4bar |81 resting onthe plate |89 is supported by ithel-'pivoted cover plate 1.3. (See Figure i2.) Thefspring251exertstension on thebar 252 to keep contact of the `bars |81 and the joint at the pivot256. At `theend lof the travel of '1t-he l platforms T24 `and 25 in a `'forward Adirection, kwhen `the two rollers 14 Aand 215 are forced towards `each :other (fsee'FifguretZ) at'theendiof the "cam :plates f5.9 andr 60, the upper --cover 121 and the lower cover J3-.simultaneously with `the action :.of Jthedcutting bythe downward motion o'f .the `:cover :12 and `theiupward motion of the cover/1.3, cause fthe .glue pott'o `slide slightly forward :and ibringthe roll v| 83 in contact 'with the' `end-sheet of paper, :depositing suflicient glue upon the paper fso v.thatwhenzthe 'rollfis finally `corn-` pletedfthe roll '|18 willfforce'thefend of the paper against the wind-ing sealing .or. sticking it Yagainst `the winding. Following athis vaction las the Vplat-- iormt28 .01126 isdrawn Ioutward the windingnis pushed i.in-or forced from the lmandrel .by means of the/collar` c258 'which iits over Vthe mandrel "|26 or 16a and lis supported by thero'd 259 which passes through the n.plates `36 and L36 and'fis mountedon lan uprightbracket 260 permanently xodonlthe platform 24`by the base 26|. When this occurs y.the `roller |118 has been pushed'beyond the position vshown in Figure .2 so ythatlthe 'Winde ingtmay roll -down'theschute 28,2. Beside the base plate26| which rmounts the bracket 426|) upon `the platform 124, there is indicated a-block 2621show-nin detaillinFig-ure 7.. This :block carries `a lprojecting bar .22.63. which rests in arecess 'inthe-lblockat the `.back endl of which is-aspring 2.64. `The bar'263 maybe rounded or pointed at the end .and :acts -as Va retaining device for the r, platform `r2.8rinward and outward. `For this :pura there are two, one :on feachside of the lmachine. i

ous telements. tofobtain :the .synchronismof the entire system will bewunderstood more tclearly from Figure `10 which shows avchartfoitlfier windV` ing .operations :and other chine. Y

` `In this chart :the :iabscissae represent an vanguf` nates representfthe distance. of travelof the platforms along ltl'le-lengtnof the machine.

ltwill be noted from 'the previous 4,descrii's'tio'r-r thattheplatformQ-d foryinstance, Figure -1, re#

mains stationary as fplatform '28 -is brought inward -to thecenter of Athe machine. The lplait-` form -2`4i then moves'fforward' at a speed controlled by the cam 3| to `theven'd of`-t'he stroke.,` whereupon; the platform 28 isf thrown loutward Yand returned toits initial position.

mayfbefollowed on'thephart of Figure l10. ,The

cycle itself may be 'followed )by the "fullq'line curve B. *"Th'isi'begins at thejpoint'marked zero on the ordinateline at 'theleft `functions of the .ma.

vThis 'cycle of foperation As the' cam rotatesy initially,1 one of the plate" forms 28 or` 29 for example 28, isbrought inward to the center. During this 'inward movement, the cam 3| associated withl the platform 28 hasprogressed in its angular rotation from the point O to C, and the other cam 33 displaced 180 has progressedfrom Eto F with the platforms 29 and y29, S distance apart and stationary vwith respect tov forward motion along the length of the machine. Also during this time a great deal of the winding has been taking place on the rst mandrel, that is the mandrel associated with the platform 2,9. At the points C and F the cams commence the forward motion of the platforms keeping the distance apart S constant, and soon accelerate the speeds of motion of the two p1at. forms making the portionsv of the curve after the points C and F at the points Dand G for instance, the same velocity as that of the lines A and A which are the same as the lvelocity of the chain ||9 in the portion |34. Both platforms continue to move forward at the velocity A to the points K and L. VWhile this occurs, the sprocket l |8 associated with the platform 28 engages the chain ||9 at the point H, and the other sprocket asso-v ciated with the platform 29 is still engaged in a chain corresponding to the chain I9 on the other side of the machine, and since both platforms are moving forward at the velocity A, no winding takes place oneither mandrel. The point J corresponds to the point I-I. Between the points J and L while the platforms are moving at the velocity A, cutting takes place. Immediately after cutting both platforms stop moving forward as shown between the points K and M and the points L and N. This allows the mandrel asso ciated with the platform 28, that is, the rear mandrel to rotate a little more than half a turn so as to bind the vpaper and foil to the mandrel, and lthe length of the paper and foil wound is proportional to the difference in the heights of' the ordinates at M, between the line A and the curve B indicated as W on the graph., From M and N to P and Q, both platforms advance together at the same constant separation S, during which time the upper and lower plates 92 and 91 which had dimensioned the paper and foil in the region between P and E separate and the sprocket associated with the rst lplatform leaves the chain I9. The second platform 28. advances from P to E by almost any desired curve, while the firstV platform 29 advances from Q to R, during which time the cone |10 is engaged with the wheel and nshing takes place from Q to some point between as T. The platform 29-then moves out from the center between T and R and the winding is ejected and then this ,first platform 29 returns to the point O to become the second platform in repeating this cycle of operation.

The only considerations of the curve from P to Ef are that the second platform never gets nearer to the rst platform than the distance S, and the slope of the curve at any point between P and E never exceeds the slope of the line A to lprevent unrolling ofthe winding being wound. 4From a consideration of the description above, it will be noted that the velocity of the paper and foils substantially remains constant as it is drawn from the rolls uponvwhich the paper and foils are originally contained. In effecting this result the linear velocity ofthe chain I9 in the portionv |34 is always kept at a constant'velocity. Thev motion of the platforms 28 and 29 forward varyV from time to time in accordance with the cams which control their forward motion. `If Vp is theinstantaneous forward velocity of the platform, and Vm is the instantaneous velocity of the mean mandrel periphery, then the relationship between the three elements may be expressed by the equation Vf=Vp+Vm, where Vf is the velocity of the foil and paper.

' After the-mandrel has gripped the vfoil and paper, if the platform moves forward at the same velocity as the sprocket chain ||9 in the portion |34, then no winding of themandrel takes place, and the only movement of the foil is that due to the movement of the platform which therefore, at that instant must be made equal `to the desired constant velocity of the foiland paper. I There-1 fore the velocity of the chain is made equal to this desired velocity. of the foil and paper. When the platform moves at a less velocitythan a sprocket chain, then the diiference is made up by the winding of the mandrel. By proper choice therefore of the fundamental driving speed of the entire system, the desired constant Vvelocity of drawing of the paper may be changed from any one constant velocity to any other constant velocity. If it is desired to increase the length of the winding or to decrease the length of the winding, the velocity of the chain I9 in the portion |34 is varied accordingly to increase or decrease the speed of the sprocket chain in proportion to the increase or decrease of the lengths of the windr ing. In such a case the maximum platform speed is made equal to the chain speed by proper choice of cams.

The chart vshown in Figure 10 illustrates diagrammatically the cycle of Aoperation ofthe ma- 35 chine. Figures 15 to 25 show modifications. Be-

fore describing this, it is well to mention Figures 12, 13 and 14, which relate to the winding of Figure 11. Figure 12 illustrates the position of u the paper and foil'of Figure 11 after the con- 40 denser winding has been severed. It will be noted that the two inner papers 48 and 49 and the two outer papers 42 and 55 are longer than the foil 45 and 52. This is brought about by the rollers 9 and I0 moving upwards lengthening the paper 48 and 49 and because of the rods and 2 which are not carried by the blocks that come together but remain in permanent position in the side plates, as for instance 30 and 36. The foils '45 and 52 are shorter therefore than the four paper sheets at the inside of the winding. When therefore these papers are twisted by the mandrel, the foils are insulated from each other. For theother end of the severed foils and papers, the rod 2 lengthens out the paper 55 as compared to the foil 52 and similarly the two papers 48 and 49. The bottom.l -paper sheet 42 is considerably lengthened by the rod 5 being pulled downward in the position indicated in 5' so that the end is completely sealed and insulated by the paper sheet.

' In Figure 14 the completed winding is shown. In this it will be noted that one foil sheet, which may be 52, projects from the left end of the winding, whilethe foil sheet 45 projects from the right end of the winding.

In Figures 15, 16 and 17, `a different arrangement of mandrel and rods is illustrated, following in general however the same principles. In this arrangement the two foil sheets 200 and 20| representing the two electrodes of the condenser are separated by the two sheets of paper 202 and 203, and covered respectively by the single sheets 204 and 205. In this case the'rods 2,06, 201, 208 and 209, are'carried by the upper plate 56 or '911 @340,340 and -therods 210, 2H 212 and` 2r| 3,- by' the lower' paper@ at the point Where it is beingv severed `asl indicated` by the arrow 2|8. Inthis position the inner ends` of the paper 204, 202 and' 203 have their edgessevered in the same straight line with thefoil 200i The other foil 20| however is shorter. The paper 205 is the samelength to the left of. thefcut in- Figure as the fother papers, so`

thatV the' papers 205 and 23 cover completely'the foil as the first portionof the turn is given t'o themandrel' 2 |10.

' At the end ofthe winding,` the severing of the foil andlpaper causes the foil andpaper to assume thep'ositionslindicatedin vFigure 17 from which it -willbe'lseenthat the inner paper `.'lilil` is longest, the foil 20|,` shortest,` and the other foils and papers of the`v same length but longer than the foi1220`|. Figures 18, 19" and'20, illustrate an arrangement in which only one-half of each plate isi movable, namely the lower half. In thiscase the plateiwhich moves vertically up and down contains the rollers 220, 22|, 222 and 223. The paperl and foil after severing` by the knife loladeI whichis atthe position of the arrow 221 is in' dicated in Figures 19 and 20. Here the mandrel 228has rst a short end foil 229 and then twopapers 230, 23|, a,v second foil 232 and two papers `233 and 234, all lof the same length, that is coming to the same edge together. At the other-ends the foils and papers are in the positionfindicated in Figure 20 with the foil 229 shorter the paper 230, 23|, 2-33 and the foil 232 lnger'thanthe foil 229, but all of the same length with the end paper 234 longest of all the slieets y C *FiguresZL 22'and-23 show a still'further modication which is similar'to that shown in Figures 18 to 20 inclusive, except that there is a` singlefinnerpaper sheet 231|` and` an outer paper 235;'V The sheet 235has the same length as the foil sheet 2-29 and both ofy these velements arey shorter thanfthe papers 230; 23|, 230 and the' foil 232; Figures 24` and 25 illustrate initiallyend insulation ofthe winding in the iirst half turn of the'mandrel when winding clockwise or counter clockwise and having the papers and foil arranged'asinFig'ureZl.

' Ilz-"should-'be noted that Vthecycle of operation is"duplicated `on'both sides of the machine and thattherefore both sides of the machine are y symmetrical with the centerline and this follows without any exception so that the parts which li'avebeen described with reference to the right sideo'f the machine or the left side of the machine' are duplicated exactly throughout the macliie.- The'two cam plates 3| and 33 are also similarly constructed but act in vsuch a manner tha-tithecyde of operationlof onel of theplatforms-reciprocated by one of thecams always remainsl vrelatively advanced over that of the oth'ei'l platform; This advance incycles 1n the present -layout is at 180? and while other degrees of 'advanced may besuit'able, the relationship of the cycles in the present layout has provento `be theiloiestil Y As has been mentioned initially in the discussion of the apparatus of the present application, the cam speed is such that together with the verthe foil and paper occurs.

manner the same is to tical movement of the various rods andthe relative motions jof thesprocket gear `||8 with the chain H0, a substantially constant drawing of winding takes place on one and as soon as the paper and foil are severed,

the mandrel in the rear continues to wind the paper and foil at substantially the same speed.

Under these conditions the tension on the foil and paper is always nearly the same and the foil and paper are always being drawn -so that great forces due to acceleration are neverpresent.r` Nor' is there much slackdue to slight dileren'ces in speeds, since regardless of the Winding of each individual mandrel, the paper and foil are always progressed forward `at substantially the same speed.

Having now particularly described and ascertamed the nature of my invention and in what? be' performed, I declareF that what I claim is: i

1'. A machine formaking condenser windings of the typedescribedf in which foil and paper is supplied from continuous rolls ofmaterial and the windings comprise a plurality of sheets of condenser foil and paper, a mandrel for receiving said sheets,4 means providing both rotation of: said mandrelfor winding said sheets vandtra-nslatory motion of said mandrel, the rotation and translator-y motions having a relationshipl to eachu other such that the feed o'f said sheets is substantially constant, -andf means for severingthe windings from said sheets during the translatory motion of said mandrel.

2. Almachine for making condenser windings of the type described in which foil and paper isY supplied from continuous rolls of: material and the' windings comprise aiplurality of sheets of condenser foil and papena pair of mandrels' adapted to receive said sheets, means alternately moving said-mandrels into engagement with said sheets', means providing both rotation of saidv mandrels forwinding saids veets and translatory motion of saidmandrels, the rotation and translatory motions having a relationship to each' other such that the feed' of said sheets is substantially constant and means for severing the windings from said sheets during the translatoryv motion of saidvmandrel.

13..A machine for'making condenser windings' of' the type described in which foil and paper is supplied-from continuous rolls of material and' the Vwindings comprise av plurality of sheets of condenser foil and paper; a-pair of mandrels adapted to receivesaid sheets, means alternately movinglsaid-mandrelsinto engagement with said: sheets at relatively the same point in the operation of the machine and means providing similar cyclic operation of 4said mandrels including means providing both rotation of said mandrels for winding said sheets and translatory motion ofi said mandrelsand" means severing the windings from' said sheets 'during a period in saidcycle in which both said mandrels haveft'ranslatory motion. 'i p14. Aimachine for making condenser windings offthe type describedin which foil and paperis supplied fromv continuous rolls of material and thewindings comprise a plurality of sheets of condenser; foil and paper, a pair of mandrels adaptedtto receive saidfsheetsmeans for mov-v ing said mandrels into engagement with said sheets at relatively the same point in the operation ofthe machine in alternate succession,A

At the time when no? l mandrel, the winding is taking place on the'mandrel in advance ofthisl means providing a cycle of operation similar for each mandrel, said cycle comprising translatory and rotational motion of said mandrel altera nately, said translatory motion of each mandrel the machine in alternate succession, means pro-Y viding a cycle of operation similar for each mandrel, said cycle comprising translatory and vrotational motion of said mandrel alternately, said translatory motion of each mandrel having coincidingperiods, and means severing the windings from the sheets during said translatory motion, the cycle with respect to each mandrel being such that a portion of the forward motion of each mandrel occurs at the same time and with the same velocity.

6. A machine formaking condenser windings of the type described in which foil and paper is supplied from continuous rolls of material and the windings comprise a plurality of sheets of condenser foil and paper, means for guiding said sheets in a continuous feed through said machine, a pair of mandrels adapted to receive said sheets, means for moving said mandrels from opposite sides of the sheets into engagement with the sheet at relatively the same point in the operation of the machine at alternate intervals, means providing a cycle of operation for each mandrel including its inward operation to engage the paper comprising, both translatory and rotational motions for said mandrels, a portion of said translatory motion occurring at the same time for each mandrel, and means for severing said windings from said sheet at a point in the translatory motion of said mandrels while each engages said sheets.

7. A machine for making condenser windings of the type described in which foil and paper is supplied from continuous rolls of material and the windings comprise a Aplurality of sheets of condenser foil and paper, means for guiding said sheets in a continuous feed through said machine, a pair of mandrels adapted to receive said sheets, means mounting and moving said mandrels inwardly to engage said sheets and longitudinally with saidI sheets, and means in part included in said previous means providing also rotational motion for said mandrels and cam means providing cyclic operation of the rotation and translatory motion of said ymandrels whereby a portion of the translatory motion of said mandrels occurs simultaneously and means for severing the winding from said sheets during the engagement of said mandrels andy during their translatory motion.

8. A machine for making condenser windings of the type described in which foil and paper is supplied from continuous rolls of material and the windings comprise a plurality of sheets of condenser foil and paper, means for guiding'said sheets in a continuous feed through said machine, a pair of mandrels adapted to receive said sheets,

means mounting and moving saidmandrels inv wardly to'engage said sheets and longitudinally with said sheets, and means in part included `in said previous means providing also rotational motion for said mandrels and cam means providing cyclic operation of the rotation and translatory motion of said mandrels whereby a portion of the translatory motion of said mandrels occurs simultaneously and means for severing the windings from said sheets during the engagement of said mandrels and during their translatory motion, the relation between the translatory Aand rotational motion of the mandrels being such` feed of said sheet for altering the length of feed' of some sheets with respect to the others.

l0. A machine for making condenser windings of the type described in which foil and paper is supplied from continuous rolls of material and the windings comprise a plurality of sheets of condenser foil and paper, a plurality of guides through which said sheets feed and are gathered together in face to face relation, a mandrel, means for aligning the mandrel to engage said assembled sheets edgewise, means for moving saidy mandrel transversely towards said sheets for en gaging the same, and means for moving said mandrel in the direction of the feed of said sheets and rotating the same to hold said sheets.

l1. A machine for making condenser windings of the type described in which foil and paper is supplied from continuous rolls of materialand the windings comprise a plurality of sheets of` condenser foil and paper, a plurality of guides through which said sheets feed and are gathered together in face to face relation, a mandrel, means for aligning the mandrel to engage said assembled sheets edgewise, means for moving said `manrel transversely towards said sheets f or engaging the same, means operatively engaging said mandrel after it has engaged said sheets for r0- tating the mandrel and means advancing said mandrel in the forward direction of feed of said sheet, said last two means reacting with one another to vary the speed of rotation of said mandrel. Y

12. A machine for making condenser windings of the type described in which foil andpaperis supplied from continuous rollsi of material and: the windings comprise a plurality of ysheets of:

- condenser foil .andV paper, a plurality of guides.

through which said sheets feed and are gatheredtogether in face to face relation, `a mandrel, means for aligning the mandrel to engage said assembled sheets edgewise, means for moving said manl drel transversely towards said sheets for engage ing the same, means for Varying the position of some of said guides in a direction away from the direction of normal feed of the sheetswhereby the feed of some sheets are lengthened over that of the other, said guides being positioned so that the sheets of paper are longerthan the Vsheets of foil both for a winding being finished and 1a winding being made. y y f f ERNST A. NORDBERG. 

